MVC3自定義驗證

Question

我有一個屬性的模型

    [Display(Name = "Phone")]
    public List<Phone> PhoneNumbers { get; set; }

我想驗證List應該大於0

建議我代碼。

/// <summary>
/// Atleast one phone number is required
/// </summary>
public sealed class DemographicPhoneNumberRequiredCheck : ValidationAttribute
{
    public override bool IsValid(object value)
    {
       ???????
    }
}

謝謝。

Answer 1

您可以使用Count或Any ：

   public override bool IsValid(object value)
    {
       var PhoneNumbers = value as List<Phone>;
       if (PhoneNumbers != null) 
       {
          return PhoneNumbers.Count() > 0;
       }

       return false;
    }

要么：

    public override bool IsValid(object value)
    {
       var PhoneNumbers = value as List<Phone>;
       if (PhoneNumbers != null) 
       {
          return PhoneNumbers.Any();
       }
    }

Answer 2

實際上你的方法有價值：

public override bool IsValid(object value)
{
    var phoneNumbers = value as List<Phone>;
    if(phoneNumbers != null) 
    {
        // perform the validation
    }
}